I have noticed recently that I can display my guardian on my PSN account but not when switching over to Steam on the active account on the Companion App. For some reason it says it cannot fetch the data/display correctly. I almost NEVER play on PSN but if I have to check something or move something from the vault while playing on PC, I have to switch to PSN as my active account in-app in order to do ANYTHING at all.
Edit: I have a screenshot just haven’t uploaded it to link. It says “No valid Destiny 2 characters were found.” This is with Steam. My main platform is PC. I haven’t logged into PSN in forever.